JPH1077466A - Antifreeze and coolant composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antifreeze and coolant composition effective in controlling the cavitation which is likely to occur in an automobile engine, particularly an engine for a large automobile by blending specified additives with an antifreeze and coolant composition comprising mainly glycols. SOLUTION: A composition used as an antifreeze and a coolant for an automobile and comprising mainly glycols is blended with 0.05-8.0wt.% p-toluic acid salt and 0.01-1.0wt.% molybdic acid salt. In addition to these additives, 0.05-8.0wt.% benzoic acid salt and/or 0.05-8.0wt.% p-tert-butylbenzoic acid can be added to the composition. The addition of the additives can effectively control the occurrence of cavitation in using the antifreeze and coolant composition. The composition does not contain a nitrous acid salt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an automobile engine,
In particular, the present invention relates to an antifreeze / coolant composition that is effective in suppressing cavitation that is likely to occur in large vehicle engines.

[0002]

2. Description of the Related Art
Metals such as aluminum, aluminum alloys, cast iron, steel, brass, solder, and copper are used in automobile engines. Since these metals corrode upon contact with water or air, automotive engines are filled with an antifreeze / coolant composition containing a corrosion inhibitor with water to prevent corrosion of these metals.

However, since a small amount of oxygen is dissolved in the antifreeze / coolant composition and water, if a pressure difference occurs in the process of circulating the antifreeze / coolant composition together with water in an automobile engine. This causes bubbles, which erode the metal, especially the iron surface,
So-called cavitation occurred. Bubbles causing cavitation were also generated by vibration.

[0004] Countermeasures against cavitation caused by the generation of bubbles due to such pressure differences and vibrations have been taken by adding nitrite to the antifreeze / coolant composition.

[0005] It is believed that nitrite added to the antifreeze / coolant composition forms a film on the surface of metals, especially iron, in automotive engines, and that this film prevents erosion by air bubbles.

[0006] As described above, although it is a nitrite that acts extremely effectively on cavitation, it is also known that the nitrite reacts with an amine salt to generate nitrosamine, a carcinogenic substance. Use has been a problem for some time.

However, since effective means for cavitation has not been found yet, nitrites are dangerous but have to be used at present.

In view of such circumstances, the present invention has been completed as a result of intensive research to find an effective and safe means for cavitation. It is an object of the present invention to provide an antifreeze / coolant composition that is effective in suppressing cavitation that is likely to occur in water.

[0009]

In order to achieve the above object, an invention according to claim 1 is directed to an antifreeze / coolant composition containing glycols as a main component which is applied to an antifreeze solution or a coolant for automobiles. In the antifreeze / coolant composition,
0.05-8.0 wt% p-toluate, 0.0
SUMMARY OF THE INVENTION An antifreeze / coolant composition comprising 1-1.0% by weight molybdate.

[0010] The invention according to claim 2 is the invention of from 0.05 to 8.0.
SUMMARY OF THE INVENTION An antifreeze / coolant composition characterized in that it further comprises a weight percent of a benzoate salt.

[0011] The invention according to claim 3 is the invention of from 0.05 to 8.0.
SUMMARY OF THE INVENTION An antifreeze / coolant composition characterized in that it further comprises by weight p-tert-butylbenzoic acid.

The gist of the invention according to claim 4 is an antifreeze / cooling liquid composition characterized by containing no nitrite.

According to a fifth aspect of the present invention, there is provided an antifreeze / coolant composition containing glycols as a main component, which is applied to an antifreeze or a coolant for automobiles. ~ 8.0 wt% benzoate, 0.0%
5 to 8.0% by weight of p-tertbutyl benzoic acid;
An antifreeze / coolant composition comprising 0.01 to 1.0% by weight of a molybdate salt is provided.

According to a sixth aspect of the present invention, there is provided an image processing apparatus comprising:
SUMMARY OF THE INVENTION An antifreeze / coolant composition characterized in that it further comprises weight percent p-toluate.

The gist of the invention according to claim 7 is an antifreeze / cooling liquid composition characterized by containing no nitrite.

The invention according to claim 8 is an antifreeze / coolant composition containing glycols as a main component, which is applied to an antifreeze solution or a coolant for automobiles. ~ 8.0 wt% benzoate, 0.0%
SUMMARY OF THE INVENTION An antifreeze / coolant composition comprising 5-8.0% by weight of p-toluate.

According to the ninth aspect of the present invention, 0.05 to 8.0 is provided.
SUMMARY OF THE INVENTION An antifreeze / coolant composition characterized in that it further comprises by weight p-tert-butylbenzoic acid.

[0018] The gist of the invention according to claim 10 is an antifreeze / cooling liquid composition characterized by containing no nitrite.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the antifreeze / coolant composition of the present invention will be described in more detail based on preferred embodiments. First, the antifreeze / coolant composition according to claims 1 to 4 will be described. This antifreeze / coolant composition is an antifreeze / coolant composition applied to automobile antifreezes and coolants, and contains glycols as a main component. Examples of the glycols include ethylene glycol, propylene glycol, 1,3-butylene glycol, hexylene glycol, diethylene glycol, and glycerin. Among them, ethylene glycol and propylene glycol are particularly preferable.

The antifreeze / coolant composition contains p-toluate and molybdate. p-Toluate has an excellent rust-preventing function against aluminum and iron-based metals, and is a component that is unlikely to cause precipitation due to reaction with a hard water component in a liquid. Each combination of these p-toluates and molybdates is known as an antifreeze /
In the coolant composition, an excellent cavitation suppressing effect is obtained.

The p-toluate salt may be any of an alkali metal, ammonium and amine, but is preferably an alkali metal, and more preferably sodium and potassium. The content of this p-toluate in the antifreeze / coolant composition is 0.05 to 8.
When the content of p-toluate is less than this range, a sufficient cavitation suppressing effect cannot be obtained, and when the content is too large, it is uneconomical.

On the other hand, the molybdate may also be any of an alkali metal, ammonium and an amine, but is preferably an alkali metal, and more preferably sodium and potassium. The content of the molybdate in the antifreeze / coolant composition is 0.01 to 1.0.
If the content of molybdate is less than this range, a sufficient cavitation suppressing effect cannot be obtained, and if the content is too large, the oxidization of the glycols as the main component is accelerated. Will be invited.

The antifreeze / coolant composition may further include a benzoate. By including this benzoate, cavitation is more effectively suppressed. Also, as is well known, aluminum benzoate has an excellent rust-preventing function against aluminum-based and iron-based metals such as aluminum castings, and further improves the rust-preventing effect of the metal together with the cavitation suppression described above. . Examples of the benzoate include sodium benzoate and potassium benzoate. The content of the benzoate in the antifreeze / coolant composition is preferably in the range of 0.05 to 8.0% by weight in order to induce the above effects.

The antifreeze / coolant composition contains p-te
By further including rtbutyl benzoic acid, cavitation will be more effectively suppressed. In addition, this p-tertbutyl benzoic acid prevents corrosion of metals containing aluminum and iron as in the case of the above-mentioned p-toluate, and hardly causes precipitation due to reaction with hard water components. As a component, a more effective rust-preventing effect of aluminum and iron-based metals is exhibited.
The content of this p-tertbutylbenzoic acid in the antifreeze / coolant composition is 0.05 to 8.0% by weight.
Is preferable.

If nitrite is not contained in the antifreeze / coolant composition, the nitrite does not react with the amine salt to generate nitrosamine, which is a carcinogenic substance. An antifreeze / coolant composition with high safety can be obtained.

In the antifreeze / cooling liquid compositions according to the first to fourth aspects, in addition to the above components, benzotriazole, tolyltriazole, 4-phenyl-1,2,
3-triazole, 2-naphthotriazole or 4
-Triazoles such as nitrobenzotriazole, nitrates such as sodium nitrate and potassium nitrate, magnesium hydroxide, magnesium oxide, magnesium carbonate, magnesium sulfate, magnesium nitrate, magnesium benzoate, magnesium glutamate, magnesium succinate,
A magnesium compound such as magnesium phthalate, magnesium salicylate, magnesium maleate, or magnesium chloride may be used in combination. in this case,
Triazoles are present in antifreeze / coolant compositions at 0.1%.
It is desirable that the content is 0.5 to 1.0% by weight, the content of nitrate is 0.01 to 1.0% by weight, and the content of the magnesium compound is 0.01 to 1.0% by weight. Further, an antifoaming agent or a coloring agent may be added as needed.

Next, the antifreeze / coolant composition according to claims 5 to 7 will be described. This antifreeze / coolant composition is an antifreeze / coolant composition applied to automobile antifreezes and coolants, and contains glycols as a main component.
The glycols in this antifreeze / coolant composition are the same as those described in the section of the antifreeze / coolant composition in claims 1 to 4, and thus description thereof will be omitted. The antifreeze / coolant composition comprises benzoate and p-
It contains tert-butyl benzoic acid and molybdate, and a combination of these three components of benzoate, p-tert-butyl benzoic acid and molybdate leads to an excellent cavitation suppressing effect.

As mentioned above, benzoate and p-tert-butylbenzoic acid are known as components having an excellent rust-preventive function against aluminum and iron-based metals, and molybdate is also known as an excellent rust-preventive component. However, these benzoates, p-tertbutyl benzoic acid and molybdate each have a function of suppressing cavitation, but the cavitation is more effectively suppressed by the synergistic effect of these combinations. Will be done.

Examples of the benzoate include sodium benzoate and potassium benzoate. antifreeze/
The content of the benzoate in the cooling liquid composition is preferably in the range of 0.05 to 8.0% by weight in order to induce the above effect. The content of p-tertbutylbenzoic acid in the antifreeze / coolant composition is preferably in the range of 0.05 to 8.0% by weight. The content of molybdate in the antifreeze / coolant composition is preferably 0.01 to 1.0% by weight.

The antifreeze / coolant composition contains p-
A toluate (preferably an alkali metal salt, an ammonium salt, an amine salt, or the like is preferable) can be further included. In this case, cavitation is more effectively suppressed. The content of this p-toluate in the antifreeze / coolant composition is 0.0
A range of 5 to 8.0% by weight is preferred.

If nitrite is not contained in the antifreeze / coolant composition, the nitrite does not react with the amine salt to generate nitrosamine, which is a carcinogenic substance. An antifreeze / coolant composition with high safety can be obtained.

In the antifreeze / cooling liquid composition according to any one of claims 5 to 7, in addition to the above components, benzotriazole, tolyltriazole, 4-phenyl-1,2,
3-triazole, 2-naphthotriazole or 4
-Triazoles such as nitrobenzotriazole, nitrates such as sodium nitrate and potassium nitrate, magnesium hydroxide, magnesium oxide, magnesium carbonate, magnesium sulfate, magnesium nitrate, magnesium benzoate, magnesium glutamate, magnesium succinate,
A magnesium compound such as magnesium phthalate, magnesium salicylate, magnesium maleate, or magnesium chloride may be used in combination. in this case,
Triazoles are present in antifreeze / coolant compositions at 0.1%.
It is preferable that the content is 0.5 to 1.0% by weight, the content of the nitrate is 0.01 to 1.0% by weight, and the content of the magnesium compound is 0.01 to 1.0% by weight. Further, an antifoaming agent or a coloring agent may be added as needed.

Next, the antifreeze / coolant composition according to claims 8 to 10 will be described. This antifreeze / coolant composition is an antifreeze / coolant composition applied to automobile antifreezes and coolants, and contains glycols as a main component.
The glycols in this antifreeze / coolant composition are the same as those described in the section of the antifreeze / coolant composition in claims 1 to 4, and thus description thereof will be omitted. The antifreeze / coolant composition includes benzoate and p-toluate.

In this antifreeze / coolant composition, the combination of the two components, benzoate and p-toluate, leads to an excellent cavitation suppressing effect. Both benzoate and p-toluate are components having an excellent rust-preventing function against aluminum and iron-based metals, but are also components that induce a cavitation suppressing effect. By using these benzoate and p-toluate components in combination, the suppression effect increases synergistically.

The content of these benzoate and p-toluate in the antifreeze / coolant composition is 0.05 to 8.0% by weight of benzoate and 0.05% of p-toluate.
To 8.0% by weight.

The antifreeze / coolant composition may further contain p-tertbutyl benzoic acid.
In this case, the content of p-tertbutyl benzoic acid is 0.1.
The range of from 0.5 to 8.0% by weight is preferred.

If nitrite is not contained in the antifreeze / coolant composition, the nitrite does not react with the amine salt to generate nitrosamine, which is a carcinogenic substance. An antifreeze / coolant composition with high safety can be obtained.

The antifreeze according to claims 8 to 10 may be used.
In the cooling liquid composition, in addition to the above components, benzotriazole, tolyltriazole, 4-phenyl-1,
Triazoles such as 2,3-triazole, 2-naphthotriazole or 4-nitrobenzotriazole, nitrates such as sodium nitrate and potassium nitrate, magnesium hydroxide, magnesium oxide, magnesium carbonate, magnesium sulfate, magnesium nitrate, magnesium benzoate, glutamic acid Magnesium compounds such as magnesium, magnesium succinate, magnesium phthalate, magnesium salicylate, magnesium maleate, and magnesium chloride may be used in combination. In this case, the triazole is 0.05 to 1.0% by weight in the antifreeze / coolant composition, and the nitrate is 0.01 to 1.
It is preferable that the content of 0% by weight and the content of the magnesium compound be 0.01 to 1.0% by weight. Further, an antifoaming agent or a coloring agent may be added as needed.

[0039]

EXAMPLES Examples of the present invention, conventional examples and comparative examples are shown in Table 1.

[0040]

[Table 1]

Next, a cavitation damage prevention performance test was conducted by the magnetostrictive vibration method for Examples, Conventional Examples and Comparative Examples relating to the coolant composition of the present invention shown in Table 1. Table 3 shows the results. In addition, the test was performed using the apparatus shown in FIG. 1 under the test conditions shown in Table 2 below.

[0042]

[Table 2]

[0043]

[Table 3]

As is clear from Table 3, Examples 1, 2,
The results of 3 and 4 were small in mass loss, and it was found that the effects of preventing cavitation damage were excellent. On the other hand, Comparative Examples 1, 2 and 3 showed that the mass loss was large, and it was also found that Conventional Example 1 had a large mass loss and the effect of preventing cavitation damage was poor. Since Conventional Example 2 contained sodium nitrite, the result that the effect of preventing cavitation damage was excellent was obtained.

[0045]

According to the present invention, 0.05 to 8.0% by weight of p-toluate and 0.01 to 1.0% by weight of molybdate are used as effective components for suppressing cavitation. Combination of ingredients, 0.05-8.0 wt% benzoate, 0.05-8.0 wt% p-ter
Combination of three components, t-butyl benzoic acid and 0.01-1.0% by weight of molybdate;
05-8.0% by weight benzoate and 0.05-8.0%.
We have proposed a combination of two components by weight of p-toluate, the antifreeze / coolant composition containing the components of each of these combinations occurring in automotive engines, especially heavy vehicle engines. Effective cavitation is effectively suppressed.

When the composition is free from nitrite, the composition is effective for cavitation, and does not generate harmful substances such as nitrosamine to the human body. Becomes

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a test apparatus.

Claims (10)

[Claims] An antifreeze / coolant composition containing glycols as a main component, which is applied to an antifreeze or a coolant for automobiles, wherein the antifreeze / coolant composition contains 0.05 to 8.
An antifreeze solution comprising 0% by weight of p-toluate and 0.01 to 1.0% by weight of molybdate.
Coolant composition. 2. The antifreeze / coolant composition according to claim 1, further comprising 0.05 to 8.0% by weight of a benzoate. 3. 0.05 to 8.0% by weight of p-tert
2. The composition of claim 1, further comprising butyl benzoic acid.
An antifreeze / coolant composition as described. 4. The antifreeze / coolant composition according to claim 1, wherein the composition does not contain nitrite. 5. An antifreeze / coolant composition containing glycols as a main component, which is applied to an antifreeze or a coolant for automobiles, wherein the antifreeze / coolant composition contains 0.05 to 8.
0% by weight of benzoate and 0.05-8.0% by weight of p
-Tert-butylbenzoic acid and 0.01 to 1.0% by weight
An antifreeze / coolant composition comprising: a molybdate. 6. The antifreeze / coolant composition according to claim 5, further comprising 0.05 to 8.0% by weight of p-toluate. 7. The antifreeze / coolant composition according to claim 5, wherein the composition does not contain nitrite. 8. An antifreeze / coolant composition containing a glycol as a main component, which is applied to an antifreeze or a coolant for automobiles, wherein the antifreeze / coolant composition contains 0.05 to 8.
0% by weight of benzoate and 0.05-8.0% by weight of p
An antifreeze / coolant composition comprising: toluate. 9. A p-tert of 0.05 to 8.0% by weight.
9. The composition of claim 8, further comprising butyl benzoic acid.
An antifreeze / coolant composition as described. 10. The antifreeze / coolant composition according to claim 8, wherein the composition does not contain nitrite.